openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
In the Linux kernel, the following vulnerability has been resolved: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style]
CVE-2026-89489
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89489
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "bf310718c6fa6adeee06d207a55489546d860e2c",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "497cba0b02e5555d99fe9ee1dc478af743ab7f7a",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "1f2e92e499d863f81df1732af59b4a3559969193",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "574ae2ac2b314aa33498cd2c28add106cbe644f2",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "a520e8cac54fb403f3800125b606f55fcad42cb9",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "d64a75369cd0f2ee79afcc9d9ca34a3890989379",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "b53435c079c78f89f70a62dd5a322cca4e292b34",
"versionType": "git"
},
{
"status": "affected",
"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
"lessThan": "78004e9a87f240df03e2f73120d291763c32e0a7",
"versionType": "git"
}
],
"programFiles": [
"arch/openrisc/kernel/entry.S"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/openrisc/kernel/entry.S"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89489
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35017 · Revision 1
- Added to Heist Feed
- Publisher date